Nearsightedness is seen in 30.4 million adults in USA (1). It's prevalence in adolescents is remarkably increased in last decades and today its prevalence in industrialized western and eastern societies are increased into 10-25 and 60-80 percent respectively (3). For American society, 60 percent of myopia can be categorized as early myopia (in childhood/school ages) which is usually in ages 9-11 years, and increases in adolescence years, and decreases in late adolescence and beginning of 20th decade of life, and usually stops at -3 to -4 D(9,10). A study in Tehran (4) showed that prevalence of myopia is 21.8 and 56.6 percent based on manifest and cycloplegic refraction respectively. Another study showed a high prevalence of myopia in schoolchildren from Kashan, Iran (11). Also a study in Dezful, Iran showed that prevalence of myopia in 7-15y and 14-18y children are 3.4 and 33 percent respectively (12).